Is it possible to integrate Quickbooks with European banks? Especially Czech and German. Maybe with Open Banking API as Nordigen? Thanks!

Do you have the QB Online Europe version?

https://quickbooks.grsm.io/EU

I can see Deutsche Bank in the list. Login to QB Online account to find your banks in their list. Another option, open a Wise Business account as a workaround to manage your multi currency accounts and utilize the bank feeds later.

https://wise.prf.hn/l/64dl92k